The Weezer account celebrated the event on social media with a video and the following caption: “For only the second time, Rivers is joined by his dad Frank Cuomo on stage, at #irvinemeadows on 8/6/16. Frank was a jazz percussionist in NYC in the late 60’s, and brought a fine flavor to Beverly Hills, layering up sweetly over Pats massive backbeats.”

During another show, this one in San Diego, Cuomo’s nine-year-old daughter Mia joined the band on keys. Watch clips of both performances below.

Cuomo recently discussed Weezer’s next album with NME: “I think it’s going to maybe be like Beach Boys gone bad. I’m thinking of swearing, which is something I’ve never done in songs. If it were a movie in the United States it would be rated R instead of PG.”

Cuomo added that the band could return to the recording studio as soon as October.